// 头部导航栏
header{
    padding: 0 20px;
    .navbar{
        width: 100%;
        height: 60px;
        display:flex;
        align-items:center;
        justify-content:space-around;
        border-bottom:1px solid #e0e0e0;
        a{
            display: inline-block;
            text-align:center;
            color: #9a9a9a;
            font-weight:bold;
            line-height:60px;
        }
        .active{
            color:#4998ff;
            &::after{
                content:"";
                display: block;
                width: 80%;
                height:2px;
                background-color: #4998ff;
                margin: 0 auto;
            }
        }
    }
}